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Characteristics of heat transfer around an obstacle controlled by the presence of ribs

Ghorbani-Tari, Zahra LU ; Wang, Lei LU and Sundén, Bengt LU (2016) In Heat Transfer Research 47(10). p.893-906
Abstract

Using liquid crystal thermography, experimental studies were carried out to investigate the local heat transfer of an obstacle integrated with a rib. The rib was positioned in the upstream region of the obstacle to disturb the boundary layer of the approaching flow by precipitating the flow separation and reatt achment. The spacing between the rib and the obstacle is of primary importance. The spacing S, which is normalized by the spanwise width of the obstacle, is equal to 1.25d and 0.625d. The effect of the rib height-To-hydraulic diameter ratio e/Dh is also of concern in this study. The e/Dh is between 0.039 or 0.078. The Reynolds number based on the spanwise width of the obstacle ranges between 35,600 and 55,600. It was found that... (More)

Using liquid crystal thermography, experimental studies were carried out to investigate the local heat transfer of an obstacle integrated with a rib. The rib was positioned in the upstream region of the obstacle to disturb the boundary layer of the approaching flow by precipitating the flow separation and reatt achment. The spacing between the rib and the obstacle is of primary importance. The spacing S, which is normalized by the spanwise width of the obstacle, is equal to 1.25d and 0.625d. The effect of the rib height-To-hydraulic diameter ratio e/Dh is also of concern in this study. The e/Dh is between 0.039 or 0.078. The Reynolds number based on the spanwise width of the obstacle ranges between 35,600 and 55,600. It was found that the local heat transfer especially in the upstream region was strongly affected by e/Dh and S/d. In the downstream region, the local heat transfer was more affected by the Reynolds number than the rib height and the spacing.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Obstacle, Rib Spacing, Ribs, Separation
in
Heat Transfer Research
volume
47
issue
10
pages
14 pages
publisher
Begell House
external identifiers
  • scopus:84989211359
  • wos:000391323000001
ISSN
1064-2285
DOI
10.1615/HeatTransRes.2016010905
language
English
LU publication?
yes
id
030e0066-e3b5-42e6-9f6c-55099ead8b3b
date added to LUP
2017-02-16 13:24:11
date last changed
2017-09-18 11:32:57
@article{030e0066-e3b5-42e6-9f6c-55099ead8b3b,
  abstract     = {<p>Using liquid crystal thermography, experimental studies were carried out to investigate the local heat transfer of an obstacle integrated with a rib. The rib was positioned in the upstream region of the obstacle to disturb the boundary layer of the approaching flow by precipitating the flow separation and reatt achment. The spacing between the rib and the obstacle is of primary importance. The spacing S, which is normalized by the spanwise width of the obstacle, is equal to 1.25d and 0.625d. The effect of the rib height-To-hydraulic diameter ratio e/Dh is also of concern in this study. The e/Dh is between 0.039 or 0.078. The Reynolds number based on the spanwise width of the obstacle ranges between 35,600 and 55,600. It was found that the local heat transfer especially in the upstream region was strongly affected by e/Dh and S/d. In the downstream region, the local heat transfer was more affected by the Reynolds number than the rib height and the spacing.</p>},
  author       = {Ghorbani-Tari, Zahra and Wang, Lei and Sundén, Bengt},
  issn         = {1064-2285},
  keyword      = {Obstacle,Rib Spacing,Ribs,Separation},
  language     = {eng},
  number       = {10},
  pages        = {893--906},
  publisher    = {Begell House},
  series       = {Heat Transfer Research},
  title        = {Characteristics of heat transfer around an obstacle controlled by the presence of ribs},
  url          = {http://dx.doi.org/10.1615/HeatTransRes.2016010905},
  volume       = {47},
  year         = {2016},
}